A clever dude making a very esoteric "joke".
He managed to get what seems like an absurd study peer reviewed and published.
I'm sure some could use that as an example of why studies can be disregarded, etc.
But the thing is, his little prank only worked because what he asserts is correct, at least in his group of 1 subjects (lol) and he did a high quality job of establishing it. He even perfectly complied with all the safety and ethics protocols required.
What it really proves is you need to weigh studies based on a number of factors. When something's been repeatedly demonstrated over long periods of time, involves well regarded scientists with a long track record. and/or large numbers of subjects involved (vs 1, lol), those are more significant than a single study out of left field.
That said what he demonstrated with oreos has a bunch of similar, more serious studies showing the same thing. As far as I can tell, if you exhibit this extremely high LDL because of super strict keto and extreme leanness, it's a formula for developing diabetes while making rapid progress towards clogging up your arteries.